Biological specimens are samples taken from living organisms for scientific study. These specimens can include tissues, blood, urine, or even entire organisms. They are used in various fields such as medicine, biology, and environmental science to understand health, disease, and ecological systems. Researchers collect biological specimens to analyze their composition, structure, and function. This analysis helps in diagnosing diseases, developing treatments, and studying the effects of environmental changes on different species. Proper handling and storage of these specimens are crucial to ensure accurate results and maintain their integrity for future research.